65129978 has 8 divisors (see below), whose sum is σ = 97935060. Its totient is φ = 32484960.

The previous prime is 65129957. The next prime is 65129983. The reversal of 65129978 is 87992156.

It can be written as a sum of positive squares in 2 ways, for example, as 64754209 + 375769 = 8047^2 + 613^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38993 + ... + 40628.

Almost surely, 2^65129978 is an apocalyptic number.

65129978 is a deficient number, since it is larger than the sum of its proper divisors (32805082).

65129978 is a wasteful number, since it uses less digits than its factorization.

65129978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80032.

The product of its digits is 272160, while the sum is 47.

The square root of 65129978 is about 8070.3146159242. The cubic root of 65129978 is about 402.3404004405.

The spelling of 65129978 in words is "sixty-five million, one hundred twenty-nine thousand, nine hundred seventy-eight".